docs: update documentation for v1.9.2
- CHANGELOG.md: Add v1.9.2 WiFi resilience changes - README.md: Update journey section, memory stats, project structure - docs/v1.9.1_HYBRID_FIX.md: Minor formatting fixes - docs/v1.9.2_WIFI_RESILIENCE.md: New detailed documentation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Alex Petrochenko
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Claude Opus 4.5
Claude Opus 4.5
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@@ -7,9 +7,6 @@
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<a href="https://github.com/petrochen/esp8266-weather-clock-opensource/blob/main/LICENSE">
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<img src="https://img.shields.io/github/license/petrochen/esp8266-weather-clock-opensource?style=flat-square&label=License&color=blue" alt="License">
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</a>
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<a href="https://github.com/petrochen/esp8266-weather-clock-opensource/actions/workflows/build.yml">
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<img src="https://img.shields.io/github/actions/workflow/status/petrochen/esp8266-weather-clock-opensource/build.yml?style=flat-square&label=Build" alt="Build Status">
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</a>
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<a href="https://github.com/petrochen/esp8266-weather-clock-opensource/issues">
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<img src="https://img.shields.io/github/issues/petrochen/esp8266-weather-clock-opensource?style=flat-square&label=Issues&color=orange" alt="Issues">
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</a>
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@@ -30,7 +27,7 @@ I bought a cute weather clock kit from AliExpress ([TJ-56-654](https://pt.aliexp
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- [The Investigation](#the-investigation)
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- [The Solution: Custom Firmware](#the-solution-custom-firmware)
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- [Technical Deep Dive](#technical-deep-dive)
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- [The Journey: v1.7 → v1.9.1](#the-journey-v17--v191)
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- [The Journey: v1.7 → v1.9.2](#the-journey-v17--v192)
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- [What's Next: Home Assistant Integration](#whats-next-home-assistant-integration)
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- [How to Flash This Firmware](#how-to-flash-this-firmware)
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- [Web Interface](#web-interface)
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@@ -378,7 +375,7 @@ Wire.begin(0, 2); // SDA=GPIO0, SCL=GPIO2
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---
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## The Journey: v1.7 → v1.9.1
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## The Journey: v1.7 → v1.9.2
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### v1.7: Display Discovery ✅
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@@ -423,7 +420,7 @@ Wire.begin(0, 2); // SDA=GPIO0, SCL=GPIO2
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**Result**: Device stays responsive during OTA updates while weather is fetching!
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### v1.9.1: Hybrid Fix (Current) 🎯
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### v1.9.1: Hybrid Fix 🎯
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**Problem Discovered:**
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@@ -454,6 +451,59 @@ void setup() {
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- ✅ Proper initialization order guaranteed
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- ✅ Device never freezes on WiFi loss during operation
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### v1.9.2: WiFi Resilience (Current) 🛡️
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**Problem Discovered:**
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After WiFi outages, the device would **clear stored credentials** and enter AP mode, requiring manual reconfiguration every time the router restarted.
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**Root Cause:**
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Aggressive credential clearing on connection failure:
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```cpp
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if (wifiRetry.currentRetry >= wifiRetry.maxRetries) {
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memset(config.ssid, 0, sizeof(config.ssid)); // ❌ Clears credentials!
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memset(config.password, 0, sizeof(config.password));
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saveConfig();
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// Enter AP mode...
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}
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```
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**Solution: Resilient WiFi**
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| Feature | Before (v1.9.1) | After (v1.9.2) |
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|---------|-----------------|----------------|
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| Credential clearing | After 5 failed attempts | Never |
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| Retry strategy | Give up after 5 tries | Infinite with backoff |
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| Max retry interval | N/A | 5 minutes |
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| Fallback AP | After clearing credentials | After ~5 min (dual STA+AP mode) |
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| Clock during outage | Blank display | Shows last synced time |
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**Key Changes:**
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- **Never clear credentials** on connection failure
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- **Exponential backoff**: 5s → 10s → 20s → ... → 5min max
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- **Fallback AP** ("TJ56654-Setup") enabled after ~5 min, while still retrying
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- **Dual STA+AP mode**: Device continues reconnect attempts while AP is active
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- **SDK credentials support**: Tries WiFiManager-stored credentials first, then EEPROM
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- **"No WiFi" display**: Shows retry countdown instead of cryptic numbers
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- **"!" indicator**: Shown in date line when WiFi disconnected
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**Network Activity Summary:**
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| Service | Interval | Endpoint | Protocol |
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|---------|----------|----------|----------|
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| NTP | 1 hour | pool.ntp.org:123 | UDP |
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| Weather | 30 min | api.open-meteo.com | HTTP |
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| mDNS | continuous | 224.0.0.251 | UDP multicast |
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~50 requests/day total.
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**Results:**
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- ✅ Credentials persist through WiFi outages
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- ✅ Device automatically reconnects when WiFi returns
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- ✅ Clock continues running with last synced time
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- ✅ User can reconfigure via fallback AP if needed
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**Startup Timeline:**
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```
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[0-5s] Display init, startup animation
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@@ -472,7 +522,8 @@ void setup() {
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| v1.7 | 34,980 (43%) | **61,987 (94%)** | 407,500 (38%) | IRAM crisis |
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| v1.8 | 36,980 (46%) | **45,120 (68%)** | 407,800 (38%) | ICACHE_FLASH_ATTR fix |
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| v1.9.0 | 37,516 (46%) | **61,987 (94%)** | 408,540 (38%) | Async libs added |
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| v1.9.1 | 37,644 (46%) | **61,987 (94%)** | 408,844 (38%) | Production ready |
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| v1.9.1 | 37,644 (46%) | **61,987 (94%)** | 408,844 (38%) | Hybrid WiFi fix |
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| v1.9.2 | 37,800 (47%) | **61,987 (94%)** | 409,100 (39%) | WiFi resilience |
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**Verdict**: Stable memory usage, no leaks detected after 24h+ uptime tests.
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@@ -868,15 +919,18 @@ Device reboots immediately.
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## Project Structure
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```
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clock_ntp_ota_v1.9/
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├── clock_ntp_ota_v1.9.ino # Main firmware (2,096 lines)
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├── v1.9_RELEASE_NOTES.md # Detailed changelog
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├── v1.9.1_HYBRID_FIX.md # WiFi startup fix documentation
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├── README.md # This file
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└── build/
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├── clock_ntp_ota_v1.9.ino.bin # Compiled firmware
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├── clock_ntp_ota_v1.9.ino.elf # Debug symbols
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└── clock_ntp_ota_v1.9.ino.map # Memory map
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esp8266-weather-clock/
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├── firmware/
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│ └── clock_ntp_ota_v1.9/
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│ └── clock_ntp_ota_v1.9.ino # Main firmware (~2,100 lines)
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├── docs/
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│ ├── HARDWARE.md # Hardware specifications
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│ ├── INSTALLATION.md # Flashing guide
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│ ├── v1.9_RELEASE_NOTES.md # v1.9.0 async refactoring
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│ ├── v1.9.1_HYBRID_FIX.md # WiFi startup fix
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│ └── v1.9.2_WIFI_RESILIENCE.md # WiFi resilience documentation
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├── CHANGELOG.md # Version history
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└── README.md # This file
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```
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---
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@@ -909,7 +963,6 @@ Now go make something cool. 🚀
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**P.S.**: If you found this useful, consider starring the repo. If you found a bug, open an issue. If you want to add Home Assistant screens, let's collaborate - I'm planning that next!
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**Built with**: Claude Code (Opus 4.5)
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**Author**: apetrochenko
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**Date**: 2026-01-03
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**Firmware Version**: v1.9.1 (Production Ready)
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**Date**: 2026-01-06
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**Firmware Version**: v1.9.2 (Production Ready)
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